We have a full page on what you need to do, here. If you’re just beginning, to start the Heist first time you need to visit Lester in Mirror Park, then buy an arcade property. GTA Online Diamond Casino Heist set up Setup: Arcade Equipment But you’ll have to pay to play thereafter. The first time you successfully run the Heist is free. There are multiple different preparation options for you to choose from at nearly every stage of setup for the Diamond Casino Heist - from when you’re casing the joint to when you’re breaking into the vault. To see this content please enable targeting cookies. Here’s a run-down of the setup board for the Diamond Casino Heist in GTA Online so you can beat the house. The Diamond Casino Heist is the biggest ever to hit GTA Online, and requires drawing up meticulous setup plans to walk away with the maximum payout.